Extract from List and Map
DataPrep supports Map and List data types . A Map is also known as the Object data type and the List is also known as an Array.
DataPrep offers extraction of data from the list and map columns using the options:
- Extract from List
- Extract from Map
To extract data from a List
1. Right-click the List column and select the option Extract from List option.
2. In the Transform panel select an option under the Convert list items to section.
3. If you have selected Columns , enter the index of the items in the list to be extracted into columns.
4. If you have selected the Rows option under Convert list items to section, you can directly convert the array items in the list to rows in the new column.
5. Click Apply .
To extract data from a Map
1. Right-click the Map column and select the Extract from Map option.
2. In the Transform panel select the keys that need to be extracted into columns.
3. Enter the column names against the keys, so that the values of each key is mapped to the respective column.
4. Click Apply .
Note : You can use these operations repeatedly to deal with JSON data that has nested data structures, such as a list of maps or list of lists.
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